Deutschland:
http://www.domaindiscount24.com/de/
http://www.inwx.de/
https://www.hexonet.net/de/preregistrations
https://www.internetx.com/new-gtld/vorbestellen.html
https://www.united-domains.de/neue-top-level-domain/
International:
http://www.name.com/account/ntld/watcher
https://gtld.domainmonster.com/
http://www.webnames.ca/pre-registration
http://www.101domain.com/new_gtld_exenstions_coming_soon.htm
http://www.entorno.com/dominios_gtld.php
https://www.instra.com/en/new-gtlds
http://www.newgtldsite.com/new-gtld-watchlist
http://www.123-reg.co.uk/domain-names/register-new-gtlds.shtml
http://www.dotanything.co/preregister.aspx
http://www.gandi.net/domain/new-extensions
http://www.ovh.de/domains/new-gtld/#/preBookingDomainNames
http://www.godaddy.com/tlds/gtld.aspx
http://www.enom.com/tld-queue/pages/watchlist.aspx
https://www.moniker.com/newgtlds/index.jsp
http://www.domain.com/domains/new-gtlds.bml
http://www.melbourneit.com.au/new-gtld-domain-names
http://www.domaindiscount24.com/de/
http://www.inwx.de/
https://www.hexonet.net/de/preregistrations
https://www.internetx.com/new-gtld/vorbestellen.html
https://www.united-domains.de/neue-top-level-domain/
International:
http://www.name.com/account/ntld/watcher
https://gtld.domainmonster.com/
http://www.webnames.ca/pre-registration
http://www.101domain.com/new_gtld_exenstions_coming_soon.htm
http://www.entorno.com/dominios_gtld.php
https://www.instra.com/en/new-gtlds
http://www.newgtldsite.com/new-gtld-watchlist
http://www.123-reg.co.uk/domain-names/register-new-gtlds.shtml
http://www.dotanything.co/preregister.aspx
http://www.gandi.net/domain/new-extensions
http://www.ovh.de/domains/new-gtld/#/preBookingDomainNames
http://www.godaddy.com/tlds/gtld.aspx
http://www.enom.com/tld-queue/pages/watchlist.aspx
https://www.moniker.com/newgtlds/index.jsp
http://www.domain.com/domains/new-gtlds.bml
http://www.melbourneit.com.au/new-gtld-domain-names